> They behave the same, starting Wampmanager asking if it is allowed to make changes etc.
This is a question asked by Windows UAC (User Account Control). Simply answer Yes* and Wampmanager will be launched.
Left- or right-clicking on the Wampmanager icon in the taskbar notification area will not generate a UAC request.
* Or set UAC to zero in Windows settings.
> wampserver has been closed down abruptly, can this be a reason?
Maybe you're right.
Since you're not using the databases (yet), the easiest thing to do would be to back up your local sites, then uninstall Wampserver, checking that the services and folder no longer exist, then reinstall Wampserver 3.3.0 and the 3.3.1 update.
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Documentation Apache -
Documentation PHP -
Documentation MySQL -
Wampserver install files & addons